pkg-config finds mingw *.a library for msvc target

[nc-x]

Found this because on my windows msvc target, cargo install rustup-toolchain-install-master finds msys2's liblzma.a, converts the name to lzma.lib which is non-existant file, and tries to compile which gives error during linking.

[nirbheek]

This is actually not a problem if your MinGW toolchain uses UCRT, which is the default CRT for the Rust toolchain. So what you actually want to do, instead of #100, is to peek inside the static library and check the CRT used by one of the object files. Same when linking to an import library.

[nc-x]

(Sorry for late reply, got busy with stuff :D)

Mingw with UCRT seems to be underdocumented and I can't seem to find any examples of how to use it.

In my mingw-w64 (msys2) installation, I do have a libucrt.a file. But I assume that its for Mingw compiled applications that want to link to ucrt. MSVC afaik cannot link to mingw's *.a files but requires *.lib files.

Do you have any example of how to use ucrt-based-mingw to link *.a to msvc programs?

[nirbheek]

Mingw with UCRT seems to be underdocumented and I can't seem to find any examples of how to use it.

There's a flag you can pass while building the MinGW/GCC toolchain to make it use UCRT instead of MSVCRT. We do that while building the toolchain for GStreamer's Cerbero build aggregator. We ship a prebuilt toolchain (mingw-6.0.0-gcc-8.2.0) here: https://gstreamer.freedesktop.org/data/cerbero/toolchain/windows/

MSVC afaik cannot link to mingw's *.a files but requires *.lib files.
Do you have any example of how to use ucrt-based-mingw to link *.a to msvc programs?

MSVC can link to both .a and .lib since both are the same format: ar archive. See also: https://mesonbuild.com/FAQ.html#why-does-building-my-project-with-msvc-output-static-libraries-called-libfooa

[nc-x]

Due to lack of time, I am unable to work on this. So, if anyone else wants to have a go at this, feel free to. 😄

[luojia65]

Any further works? Our project depends on it. Now I am unable to build GTK on Windows only because of this problem